Wheel manufacturing method

Abstract

The present invention provides wheel manufacturing method comprising a pressing step in which a primary molded product having a cylindrical shape with a bottom in which a flange part that extends to the outside is disposed on the open side end part is manufactured, a working step in which a secondary molded product is obtained by cutting away the bottom part of the abovementioned primary molded product, and a spinning step in which, the secondary worked product is fit over and fastened to a rotating jig, a rim flange molding roller is pressed against the end part of the flange part while the secondary worked product is rotated together with the rotating jig, so that the flange part is gradually molded into the shape of a rim flange part, and the flange part is subsequently subjected to an angular adjustment to an appropriate angle to mold a rim flange part.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a wheel manufacturing method.[0003]2. Description of the Related Art[0004]One-piece type wheels which are integrally molded by casting, two-piece type wheels with a construction that is split into two parts, i.e., a rim and a disk, and three-piece type wheels with a construction that is split into three parts, i.e., an inner rim, and outer rim and a disk, are widely used as vehicle wheels that consist of light alloys such as aluminum alloys or the like.[0005]In the case of two-piece type wheels and three-piece type wheels, wheels in which the disk is manufactured by casting or forging, and the rims are constructed using rolled metal plates have been adapted for practical use. Rims that are used in such cases include products in which band form rolled metal plates are rolled up into a cylindrical shape, both ends are welded, and the produced is molded into a desired shape by spinning, and...

AI Technical Summary

Benefits of technology

Enables the production of wheels with enhanced strength and rigidity in rim flange parts using a low-output spinning apparatus, preventing plating liquid accumulation and corrosion, while allowing for cost-effective and efficient manufacturing of diverse types of wheels.

Problems solved by technology

However, when it is attempted to work this manufacturing method, a high-output spinning apparatus is required.

In cases where an inexpensive, low-output existing spinning apparatus is used, the metal material of the trunk body part cannot be sufficiently moved to the sides of the flange parts, so that it is necessary to replace the spinning apparatus with a newly purchased spinning apparatus; thus, there are problems in terms of equipment economy so that this method cannot be used in a practical application.

However, in cases where flange parts are clamped between a mandrel and a tailstock and rim flange parts are molded by means of a rolling roller as in the abovementioned Japanese Patent Application Laid-Open No. 2-160131, the following problem arises: namely, the engaging surfaces catch on the mandrel, so that the molded rims cannot be removed from the mandrel.

Accordingly, in this second thickness-increasing spinning, it is difficult to increase the thickness of the rim flange part to the required thickness, so that it is necessary to use this as an auxiliary to the first thickness-increasing spinning.

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